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Guam sits beside the Mariana Trench, the deepest place in the ocean, and feels frequent offshore earthquakes. This page pulls real records for Guam: the largest earthquakes on record from USGS, how often the ground shakes nearby, tsunamis from the NOAA database, and volcanoes from the Smithsonian program. Nothing is guessed.
A quiet recent record is good news, but many damaging earthquakes strike places that were quiet for decades. The only real protection is a warning the moment the ground moves - which is exactly what the free QuakeMate app gives you, along with tsunami and volcano alerts for Guam.
Earthquake risk in Guam - FAQ
Is Guam at risk of earthquakes?
Yes. On average about 143 quakes a year nearby of magnitude 4+ within 300 km, based on the last 20 years of USGS data. The strongest earthquake on record nearby is M7.8 in 1993.
What was the biggest earthquake in Guam?
The strongest earthquake on record near Guam is M7.8, in 1993 (32 km S of Inarajan Village, Guam), from USGS.
Does Guam get tsunamis?
Yes - 8 tsunamis since 1767 (most recently 1993) within 300 km, from the NOAA database.
How do I get earthquake warnings in Guam?
Download the free QuakeMate app for iPhone. It watches your location and sends a real-time push the instant a quake strikes nearby, plus tsunami and volcano alerts, with custom magnitude and distance rules. On Android, join the waitlist.